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Income Taxes (Details 1) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May. 31, 2015 | Feb. 28, 2015 | Nov. 30, 2014 | Aug. 31, 2014 | May. 31, 2014 | Feb. 28, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Current: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 341.4 | $ 314.5 | $ 274.2
State |  |  |  |  |  |  |  |  | 47.8 | 51.0 | 62.9
Total current |  |  |  |  |  |  |  |  | 389.2 | 365.5 | 337.1
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (5.1) | (3.5) | 5.5
State |  |  |  |  |  |  |  |  | 1.0 | (1.4) | (0.2)
Total deferred |  |  |  |  |  |  |  |  | (4.1) | (4.9) | 5.3
Income taxes | $ 92.4 | $ 96.5 | $ 98.6 | $ 97.6 | $ 83.8 | $ 92.1 | $ 91.2 | $ 93.5 | $ 385.1 | $ 360.6 | $ 342.4

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